soontobeamrs's Pink wedding

Here are some dresses I'm loving. My favourite is the black-with-white-polka-dot dress, too cute, but I'm not sure how "bridesmaidy" it is. I'm really lucking out, the dresses I (and my girls) like best tend to be the cheapest. Sears Canada has several very cute dresses that fit my theme perfectly, and all are under $100!!
However, I'm not sure when I should order them, I really like the polka-dot dress, but I am concerned it may be a bit too early. MY MOH is trying for a baby, and who knows what shape she will be by next summer (she could be very pregnant by then!). But, I'm worried if we wait, I wont be able to find a dress I like. Decisions, Decisions! Buy the perfect dress now, or wait and take our chances?